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G-071 / octotiger-spack

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Allow for Grace Hopper builds #1

Closed diehlpk closed 5 months ago

diehlpk commented 10 months ago

On Grace Hopper, we want to use SVE since it is an ARM CPU. However, that requires C++ 20.

146 CMake Error at CMakeLists.txt:826 (message): 147 SVE builds with std::experimental::simd require C++20. Please set 148 OCTOTIGER_WITH_CXX20=ON 149 150

But we do not support CUDA builds with C++ 20

127 CMake Error at CMakeLists.txt:128 (message): 128 CUDA builds with C++20 are not supported right now

On the other side CUDA >=12 supports C++ 20.

Can we fix that?

G-071 commented 5 months ago

I think we can close this as #3 added support for C++20 to the spack package.

That being said, using SVE in the GPU builds is still problematic (see explanation in #7 ), however, that compilation issue is not directly related to the actual spack package in this repository.